Lettuce knife



FIG. 1 is a front view of the lettuce knife;

FIG. 2 is a top view of the lettuce knife;

FIG. 3 is a bottom view of the lettuce knife;

FIG. 4 is a back view of the lettuce knife;

FIG. 5 is a left side view of the lettuce knife;

FIG. 6 is a right side view of the lettuce knife; and,

FIG. 7 is a perspective view of the lettuce knife. 

I claim the ornamental design for the lettuce knife, as shown. 